What role does glycerin play in skincare formulations?

Glycerin serves as a humectant in skincare formulations, which means it has the ability to attract moisture from the environment into the skin. This property makes glycerin particularly effective in hydrating the skin, as it helps to maintain its moisture balance, leading to a softer and more supple appearance.

Humectants like glycerin are beneficial for all skin types, especially for those experiencing dryness or dehydration. By drawing water into the upper layers of the skin, glycerin helps to create a protective barrier that keeps the skin hydrated for longer periods.

In contrast, the other options do not accurately describe the primary function of glycerin. While exfoliants are important for skin cell turnover, glycerin does not possess abrasive qualities. Additionally, while some ingredients in skincare formulations serve as preservatives to inhibit microbial growth, glycerin itself is not primarily categorized as such. Finally, SPF protection is provided by specific active ingredients formulated to shield the skin from UV radiation, and glycerin does not offer this type of protection.